Band-saw.



R. C. BERRY.

BAND SAW.

' APPLICATION FILED AUG.3, 19M. 1,152,696, PatentedSept. 7, 1915,

2 SHEETS-SHEET I.

WITNESSES:

93M @M M R. C. BERRY.

BAND SAW.

APPLICATION FILED MIG-3,1914.

1 9 1 figfigfim A Patented Sept. 7, 1915.

2 SHEETS-SHEET 2.

i ii D ZWIIME ILA!! l T0 NEVs ROBERT C. BERRY, OI INDIANAPOLIS, INDIANA.

BAND-SAW.

Specification of Letters Patent.

Patented Sept. t, 1915.

Application filed August 3,1914. Serial no. 854,625.

To all whom'it may concern Be it known that I, ROBERT C. BERRY, acitizen of the United States, residing at In-' dianapolis, in the countyof Marion and State'of Indiana, have invented a new and .usefulBand-Saw, of which the following is a specification.

,My invention relates to band saws, espe cially for sawing metal. Itsobject is to provide a construction whereby the work remains stationaryand the saw band travels; the idle side of the saw band does notinterfere with the work, even though long pieces are being sawed; thefeeding of the saw to the work is automatic, with either a uniform feedpressure or a varying feed pressure as desired; and the varying feedpressure,

' thereof; Fig. 4 is a partial section on the line 44 of Fig. 2; andFig. 5 is an axial section through the mounting of the lower band wheel.I

The supporting base 10 carries an up- I right 11, conveniently integralwith the base, and in the upper end of the upright is a slide 12,vertically adjustable by. a hand wheel 13. Lower and upper horizontalshafts 14 and 15 are suitably supported in the upright 11 and the slide12 respectively; and these two shafts, which are conveniently in thesame vertical plane, support lower and upper band wheels 16 and 17, overwhich the saw band 18 travels in the direction indicated by the arrows.The hand wheel 13 provides for adjusting the tension of this saw band.At least one of the shafts, conveniently the lower one 14, is journaledin its support, and this shaft is provided with suitable driving means,such as fast and loose pulleys 19 and 20, the band wheel 16 carried bythis shaft being suitably mounted so that it is driven thereby. In oneform of this mounting, shown in Fig. 5, a sleeve 21 is splined at 22 onthe shaft 14 so as to rotate therewith while being axially slidabletherealong, and this sleeve is spherical exteriorly and provides asupport for the band wheel 16, the interiorvof the hub 23 of which is asegment of a sphere.

fitting on the sleeve 21, the band'wheel belng compelled to rotate withthe sleeve by reason of two diametrically opposite pins 24 which projectinward from the hub 23 into 2 two grooves 25 in the surface of thesleeve 21, these grooves 25 being opposite each other and co-planar withthe axis of the shaft 14. The pins 24 may fit rotatably in slide blocks24 sliding in the grooves 25.

For assembling purposes, the hub 23 is made in two parts fastenedtogether by bolts 26, one part being integral with the band'wheel l6proper and the other being a cap piece 27. By reason of this mounting,the band wheel 16 is driven by the shaft 14, but is slidable axially ofsuch shaft and may rotate about an axis at an angle to the axis of suchshaft, for reasons hereinafter apparent.

The mounting fortheband wheel 17 is similar to that of the band wheel16; save that the spline 22, pins 24, and grooves 25 may be omitted,especially if the shaft 15 is not mounted for rotation. Y

The piece to be sawed, shown as a piece of round metal 30, is supportedon a stationary table 31, usually horizontal, and is held stationarybetween" stationary and movable vise jaws 32 and 33, the latter be: ingadjustable by a hand screw 34. The piece of metal 'to be sawed, andconsequently the "vise jaws, are perpendicular to the plane of theshafts 14 and 15 when the piece is to be sawed ofi' square, and thatpart of the saw band which at any time is operated on the metal is heldin a plane parallel to such shafts by slotted guide fingers 35 and36above and below the, piece of metal being sawed, these guide fingershaving rollers 37 at the bottoms -of their slots for pressing againstthe back edge of the saw band and being parts of a yoke 38 adjustablymountedon the forwardly. projecting arm 39 of a feed frame 40 whichis'slidable forwardly and rearwardly to feed the saw to cut off thepiece of metal. The feed frame is slidably supported on the upright 11,and in addition to its central forwardly extending arm 39 also hasupwardly and downwardly extending arms 41 and 42, the arm 41 carrying avertically movable slide 11 and the slide 12, and their forward ends 43in its upper end for permitting adjustment corresponding to that of theupright 11 and its slide 12.

The arm 42 and the slide 43 of the feed frame are each drilled toreceive a pair of rods 44, which extend forward parallel-to the shafts14 and 15 and may be clamped by screws 45 in any desired position onsuch arm and slide. These rods 44 fit slidingly in perforated guide lugs46 on the upright are fixed to plates 47, of which there is one for eachofthe band wheels. Each of these plates is attached to the sleeve 21 ofthe adjacent band wheel 16 or 17 so as to allow such sleeve to rotatefreely independently of the plates while preventing it from. havingaxial movement save with such plate, this attachment conveniently beingby a circumferential groove 48 in one end of the sleeve 21 into whichgroove" extends the plate 47 or a part mounted thereon. Each plate 47carries a plurality of screws 50, adjustable in and extendingtransversely of their respective plates, and the rounded ends of thescrews 50 on each plate bear .against a lateral face of a ring 51 withwhich each band wheel 16. and 17 is provided. By adjusting the screws50, the plane of the band wheels 16 and 17 and saw .band 18 may beadjusted to any desired angle, right or oblique, to the' plane of theshafts 14 and 15, so that the I upwardmunning side of the saw band maybe made to take any desired position relative to the downward-runningside and by setting for an oblique angle long pieces may be sawedwithout being interfered with by such upward-running side. The guidefingers and 36 skew the working part of the downward-running side of thesaw so that it is. parallel to the shafts 14 and 15. Thus by moving thefeed frame forward and backward the saw and its supporting band wheelsare also moved forward and backward, such movement always being parallelto the shafts'14 and. 15.

While the movement of the feed frame may be obtained entirely by hand,as by' a handle 52 on such feed frame, I prefer to make the forward .orcutting movement thereof an automatic one. To-this end the feed frame isprovided with a rearwardly extending arm 55, which on its under side hasrack teeth which mesh with a gear 56 fast on a longitudinal shaft 57suitably ported on the rear of the upright 11. Also fastened on theshaft 57 are a disk sector 58 and an arm 59, the latter being providedwith a slide 60 movable longitudinally of the armand carrying aremovable pin 61 which projects into the plane of the disk sector 58. Astrap 62 is fastened ,at one end to the disk sector 58 and at the otheris provided with a weight 63' of adjustable size. The intermediate partof the strap 62 may supat its inner end with a bevel gear 65 which.

meshes with a bevel gear 66 fixed on a sleeve 67 loose on the shaft 57.The sleeve 67 also has fixed thereon a gear 68, which meshes'with a rack69'suitably connected to the movable vise jaw 33 so as to be movedthereby. Thus a movement of the vise jaw 33 produces a movement of theslide 60 and pin 61 along the arm 59 to vary the distance of the pinfrom the shaft 57 in the same sense as the distance between the two visejaws varies. The weight 63 tends to move the feed frame forward, andwith it the band wheels and saw. When the strap 62 is only onthe sector58, the pressure of the saw on the work is substantially uniformthroughout the cut, being variable in amount by adjusting the size ofthe weight 63; this'is the ordinary arrangement when square or otherwiserectangular pieces of metal are being sawed. When the strap 62 extendsover the pin 61, however, the effective lever arm of the weight varieswith the movement of the shaft 57, so that the force of the saw on thework increases as the arm 59 approaches the horizontal and decreases asit continues its movement below the'horizontal, the arm becominghorizontal at substantially the middle of the out (though the drawingsmay not be mathematically accurate in this respect); this arrangement isordinarily usedwhen round pieces are being sawed. Moreover, with thislatter arrangement the effective lever arm of the weight 63 is alsovaried by the movement of the movable vise jaw 33 to receive differentsizes of work, for the distance of the pin 61 from the shaft 57 variesin the same sense slide 60 the angular swing of the arm 59 may bemaintained the same for all lengths of cuts, the pressure of the saw onthe work varying both in the same. sense as the size of the Work and ininverse sense as the distance of the saw from the center of the cut. Theforward or cutting movement of the saw may be stopped in any suitablemanner after the out is completed, as by an adjustable stop screw 70carried by the upright 11 in the path of the arm 59. After a cut iscompleted, the saw, band wheels, and feed frame are returned to normalposition by any suitable returning means; as shown, there is a strap 71fastened to and-extending around a disk 72 fixed on the shaft 57 this.1,152,cee

upon which the operator may pull to move the saw backward. A hook 74 maybe provided to receive the handle 73 to hold the saw in its rearwardposition if desired.

I claim as my invention:

1. A band saw, comprising the combination of two band. wheels forreceiving the saw band and having their axes substantially parallel, adriving'shaft carrying one of such band wheels and having its axis at anangle to the axis of such band wheel, guides for skewing the cuttingpart of the saw band 'so that it is in a plane parallel to such shaftaxis, and means for moving the band wheels parallel to such shaft axis.

2. A band saw, comprising the combinationof two band wheels forreceiving the saw band and having their axes substantially parallel, adriving shaft carrying one of such band wheels and having its axis at anangle to the axis 'of such band wheel, and means for moving the bandwheels parallel to such shaft axis.

3. A band saw, comprising the coinbina tion of two band wheels forreceiving the saw band and having their axes substantially parallel, adriving shaft carrying one of such band wheels and having its axis at anangle to the axis of such band wheel, and guides for skewing the cuttingpart. of the saw band so that it is in a plane parallel to such shaftaxis.

4. A band saw, comprising the combination of two band wheels forreceiving the saw band and having their axes substantially parallel, anda driving shaft carrying one of such band wheels and having its axis atan angle to the axis of such band wheel.

5. A band saw, comprising the combination of two band wheels forreceiving the saw band, means for holding stationary the work to besawed, means for supporting said band wheels so that they can be'moved'parallel to the line of sawing, means for transmitting power to one ofsaid band wheels, and means for varying the angle between the axes ofthe band' wheels and the line of such movement and still maintaining theoperative connection between one of such band wheels and the samepowertransmitting means.

6.'A band saw, comprising the combination of two band wheels forreceiving the saw band, means for holding stationary the work to besawed, means for supporting said band wheels so that they can be movedparallel to the line of sawing, and automatic means for moving such bandwheels to feed the saw into the piece being sawed with a forcewhichvaries during the sawing stroke.

7. A band saw, comprising the combination of meansfor holding stationarythe work to be sawed, two band wheels for receiving and supporting "asaw band, so that the latter can be moved parallel to the desired lineof sawing, and automatic means for feeding the cutting portion, of thesaw band along the line of cutting with a force 1which varies atdifferent points along such 8.'A band saw, comprising the combination ofrelatively movable vise jaws for' holding stationary the work to besawed, two band wheels for receiving and supporting a saw band so thatthe latter can be moved parallel to the desired line of sawing, meansfor automatically feeding the cutting portion of said saw along suchline into the piece being sawed, and means controlled by the distancebetween the vise jaws for varying the force with which the saw is sofed.

9. A band saw, comprising the combination of relatively movable visejaws for holding stationary the work to be sawed, two band wheels forreceiving and sup porting a saw band sothat the latter can be movedparallel to the desired line of sawing, means for feeding the cuttingportion of said'saw along such line into the piece being sawed with aforce which varies at different points along such line, and meanscontrolled by the distance between the vise jaws for varying such force.

10. A band saw, comprising the combination of means for holdingstationary the work to be sawed,.two band wheels for receiving andsupporting a saw band so that the latter can be moved parallel to thedesired line of sawing, a rotatable member operating on said saw forfeeding its cutting portion alongsuch line into the piece being sawed,and a weight connected to said rotatable member and tending to rotate itto produce such feeding, said rotatable member having a pin from whichsaid weight hangs so that the eflective leverage of the weight variesduring the saw-feeding movement.

11. A band saw, comprising the combination of means for holdingstationary the work tobe sawed, two band wheels for receiving andsupporting a saw band so that the latter can be moved parallel to thedesired line of sawing, a rotatable member operating on said saw forfeeding its cutting portion along such line into the piece beingsawed, aweight connected to said rotatable member and tending to rotate it toproduce such feeding, said rotatable member having a pin from which saidweight hangs so that the effective leverage of the weight varies duringthe saw feeding movement, and means for varying the distance of said pinfrom theaxis of said rotatable member.

. 12. A band saw, comprising the combina tion of relatively movable visejaws for holding. stationary the work to be sawed, two band wheels forreceiving and supporting a sawband so that the latter can be connectedto said rotatable member and moved parallel to the desired line of saw--ing, a rotatable member operating on said saw for feeding its cuttingportion along such line into the piece being sawed, a weight connectedto said rotatable member and tending to rotate it to produce suchfeeding, said rotatable member having a pin from which said weight hangsso that the effective leverage of the weight varies during thesaw-feeding movement, and means controlled by the distancebetween saidvise jaws for varying the distance of said pin from the axis of saidrotatable member.

13. A band saw, comprising the combination of relatively movable visejaws for holding stationary the work to be sawed, two band wheelsforreceiving .and supporting a saw band so that the latter can be movedparallelto the' desir'ed line of sawing, a rotatable member operating onsaid saw for feeding its cutting portion along such line into the piecebeing sawed, a weight tending to rotate it to produce such feeding,and'means controlled by the distance between said vise jaws for varyingthe length of the lever arm by which said weight acts on said rotatablemember.

14. A band saw, comprising work to be sawed, two band wheels forreceiving and supporting a saw band so that the latter can be movedparallel to the desired line of sawing, a'rotatable member operating onsaid saw for feeding its cutting portion along such line into the piecebeing sawed, a weight connected to said rotatable member and tending torotate it to produce such feeding, and means for varying the length ofthe lever arm by which said weight acts on said rotatable member.

15. A band saw, comprising means for supporting the work to be sawed,two band wheels for receiving and supporting the saw band, means forvarying the angle between the axes of such band wheels and the line ofsawing, and a driving shaft carrying one of such wheels and having its'axis p to that of the shaft, a member slidable relaat a fixed angle tothe line of sawing.

16. A band saw, comprising means for supporting the work to be sawed,two band wheels for receiving and supporting the saw band, means fortransmitting power to one of said band wheels, and means for varying theangle between the axes of such band wheels and the line of sawing and vstill maintaining the operative connection between one of such bandwheels and the same power-transmitting means.

17. A band saw, comprising means. for

supporting the work to be sawed, two "band wheels for receiving andsupporting the saw band, means for varying the angle between the axes ofsuch band wheels and the line of sawing, a driving shaft carrying onethe eombination of means-for holding stationary the of such wheels andhaving its axis at a fixed angle to-the line of sawing, and means for'maintaining the cutting portion of the saw in the plane of the line ofsawing.

18. A-band saw, comprising a supporting frame, a shaft mounted forrotation therein and provided with means for receiving power, a sleevesplined on such shaft, a band wheel mounted on said sleeve so as torotate therewith when the shaft is rotated but so that of the shaft,means forvarying the" angle between the axes of said band wheels and theaxis of the shaft, a band saw carried by said two band wheels, and meansfor and the band wheels carried thereby relatively to the frame in adirection parallel to said shaft. 19. A band saw, comprising asupporting movlng said sleeve and said sliding member frame, a shaftmounted for' rotation therein and provided with .means for receivingpower, a sleeve splined on such shaft, a band wheel mounted on saidsleeve so as to rotate therewith when the shaft is rotated but so thatit can do so about 'an axis at an-angle to that of the shaft, a memberslidable relatively to said frame in a direction parallel to said shaft,a second band wheel mounted on said sliding member so that when rotatedit may do so about an axis at an angle to that of the shaft, a band sawcarried by said two band wheels, and means for moving said sleeve andsaidsliding member and the band wheels carried thereby relatively to theframe in a direction parallel to said shaft.

20. A band saw, comprising a supporting frame, a shaft mounted forrotation therein and provided with means for receiving power, a sleevesplined on such shaft, a band wheel mounted on said sleeve so as torotate therewith when the shaft is rotated but so that it can do soabout an axis at an angle tively to said frame in a direction parallelto said shaft, a second band wheel mounted on said sliding member sothat when rotated it may do so about an axis at an angle to that of theshaft, means for varying the angle between the axis of said band wheelsand the axis of the shaft, and a band saw,

tively to said frame in a. direction parallel to said shaft, a secondband wheel mounted on said sliding member so that when rotated it may doso about an axis at an angle to that of the shaft, and a band sawcarried by said two band wheels.

22. A band saw, comprising a supporting frame, a shaft mounted forrotation therein and provided with means for receiving power, a sleevesplined on such shaft, a band wheel mounted on said sleeve so as torotate therewith when the shaft is rotated but so that it can do soabout an axis at an angle to that of the shaft, a member slidablerelatively to said frame in a direction parallel to said shaft, a secondband wheel mounted on said sliding member so that when rotated it may doso about an axis at an angle to that of the shaft, a band saw carried bysaid two band Wheels, means for holding stationary the work to be sawed,and means for automatically moving said sleeve and said sliding memberand the band wheels carried thereby relatively'to the frame and the workto be sawed in a direction parallel to said shaft with a force whichvaries at different points in the movement.

23. A band saw, comprising a supporting frame, a shaft mounted forrotation therein and provided with means for receiving power, a sleevesplined on such shaft, a band wheel mounted on said sleeve so as torotate therewith when the shaft is rotated but so that it can do soabout an axis at an angle to that of theshaft, a member slidablerelatively to said frame in a direction parallel to said shaft, a secondband wheel mounted on said sliding member so that when rotated it may doso about an axis at an angle to that of the shaft, a band saw carried bysaid two band wheels, means for holding stationary the work to be sawed,and means for automatically moving said sleeve and said sliding memberand the band wheels carried thereby relatively to the frame and the workto be sawed in a direction parallel to said shaft with a force which iscontrolled by the position of said work-holding means. In witnesswhereof, I have hereunto set my hand at Indianapolis, Indiana, this 31stday of July, A. D. one thousand nine hundred and fourteen. v

' I ROBERT C. BERRY. Witnesses:

G. B. SCHLEY, FRANK A. FAHLE.

